<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider ">
            <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll">
                    <!-- 所有都是高亮，是因为没循环一次就会添加一次active的类，绑定成属性 -->
                    <!-- 设置默认选中全部 -->
                    <a :class="['mui-control-item', item.id == 0?'mui-active':'']" v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
                        {{item.title}}
                    </a>
                    
                </div>
            </div>
        </div>

        <!-- 图片列表区域 -->
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id" :to="'/home/photoInfo/'+item.id" tag="li">
                <img v-lazy="item.image">
                <div class="info">
                    <h1 class="info-title">{{item.title}}</h1>
                    <p class="info-body">{{item.zhaiyao}}</p>
                </div>
            </router-link>
        </ul>
    </div>
</template>
<script>
import mui from '../../lib/mui/js/mui.min.js'

export default {
    data(){
        return{
            cates:[],
            list:[] //图片列表
        }
    },
    created(){
        this.getPhotoInfo();
        //默认加载全部 
        this.getPhotoListByCateId(0);
    },
    mounted(){ //当组件中的DOM结构被渲染好并放到页面中后，会执行这个钩子函数
    //如果要操作元素，最好在mounted中，这时的元素是最新的
        mui('.mui-scroll-wrapper').scroll({
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        });
    },
    methods:{
        getPhotoInfo(){
            this.$http.get("src/json/photoinfo.json").then(result=>{
                if(result.body.status === 0){
                    //手动拼接出一个完整的列表
                    result.body.message.unshift({title:'全部',id:0})
                    this.cates = result.body.message
                }
            })
        },
        getPhotoListByCateId(cateId){
            //根据分类id获取图片列表
            this.$http.get('src/json/photolist'+cateId+'.json').then(result=>{
                this.list = result.body.message
            })
        }
    }
}
</script>
<style lang="scss" scoped>
    *{
        touch-action: pan-y;
    }

     
   .photo-list{
        margin: 0;
        padding: 10px;
        padding-bottom: 0;
      li{
            list-style: none;
            background-color: #ccc;
            box-shadow: 0 0 9px #999;
            margin-bottom: 10px;  
            position: relative;                  
            bottom: 0;
            img{
                width:100%;
                vertical-align: middle; 
    
            }
            img[lazy=loading] { 
                width: 40px;
                height: 300px;
                margin: auto;
            }
            .info{
                color:#fff;
                background-color:rgba(0, 0 ,0 ,0.4);
                position: absolute;
                bottom: 0;
            }
            .info-title{
                font-size: 14px;
            }
            .info-body{
                font-size: 13px;
            }

        }
       
   }


           
    
</style>
